While the computer visualization has been used in various research fields, there is no practical application to the analysis of insect behaviour. In addition, some interests have been taken in what conditions disturb the normal spinning process of a silkworm or in how the silkworm behaves under abnormal conditions. We, therefore, investigated the silkworm's repairing behavior when a small part of the cocoon being spun was cut. Then, after some statistical models were constructed to represent the silkworm's behavioural pattern, a simulation method was devised using the results. Furthermore, we tried to develop a new computer visualization system for the research of silkworm's behaviour. The results are as follows ; 1. Analysing the fixing and moving of a silkworm body during spinning process, we showed that the periods of time approximately follow the mixture Gamma distribution for the moving and lognormal distribution for the fixing. 2. The relationship between the period of moving time and the moved angle of a silkworm body was represented by an equation. 3. A new simulation algorithm was devised for the spinning behavior of a silkworm. 4. A 3D visualization system for silkworm's behavior was developed using a Windows personal computer. 1.通常環境下でのカイコの吐糸行動において,蚕体の固定時間と移動時間に注目し解析を行い,これらの分布特性を明らかにした。 2.蚕体固定位置の時間的変化と固定方向の変化データを詳細に解析し,吐糸営繭中の移動周期性および移動時間と方向角との関係等に関する知見を得た。これを基に通常環境下での基本モデルを作成することができた。3.さらに,異常環境下,特に営繭中に繭一部を切断した時の蚕の繭修復行動データから,吐糸営繭段階,切断個所の大きさ,修復時間との関係を解析し,異常環境下での吐糸行動の基本モデル作成に対する知見を得ることができた。3.上記1,2,3の結果をもとに営繭行動シミュレーションの基本アルゴリズムを構築することができた。 4.パーソナルコンピュータ上の基本OSであるウインドウズ95/98/NT/2000上で簡単に利用できる「カイコ行動視覚化システム」を開発することができた。